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114553

Sigma-Aldrich

Thymolphthalein

ACS reagent, Dye content 95 %

Synonym(s):

5′,5′′-Diisopropyl-2′,2′′-dimethylphenolphthalein

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About This Item

Empirical Formula (Hill Notation):
C28H30O4
CAS Number:
Molecular Weight:
430.54
Beilstein:
359413
EC Number:
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47

grade

ACS reagent

Quality Level

form

solid

composition

Dye content, 95%

clarity of soln

passes test

technique(s)

titration: suitable

visual transition interval

8.8-10.5, colorless to blue

mp

251-253 °C (lit.)

λmax

396 nm (2nd)
592 nm

SMILES string

CC(C)c1cc(c(C)cc1O)C2(OC(=O)c3ccccc23)c4cc(C(C)C)c(O)cc4C

InChI

1S/C28H30O4/c1-15(2)20-13-23(17(5)11-25(20)29)28(22-10-8-7-9-19(22)27(31)32-28)24-14-21(16(3)4)26(30)12-18(24)6/h7-16,29-30H,1-6H3

InChI key

LDKDGDIWEUUXSH-UHFFFAOYSA-N

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General description

Thymolphthalein (5′, 5′′-Diisopropyl-2′, 2′′-dimethylphenolphthalein) is an acid-base indicator which is colorless in solutions with a pH below 8.5 and blue in solutions with a pH above 9.5. Thymolphthalein has been used as an indicator in periodate-thiosulfate reaction.

Application

Thymolphthalein has been used as a pH indicator in [14C] urea breath test to determine when the CO2 trap is full.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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